为探究七姊妹山泥炭藓湿地大泥炭藓（Sphagnum palustre L.）群落的分布格局及其驱动机制，进而为亚热带山地泥炭藓湿地保护、恢复和开发利用提供科学的理论依据，于2021年6月，对该湿地泥炭藓斑块设置样方，使用标准样方法进行植被、环境调查，同时采集样品进行测量分析。运用系统聚类法进行群落的数量分类，随后使用单因素方差分析、多元回归分析及Pearson相关性分析检验各群丛间环境因子以及大泥炭藓生长、生理指标的差异及其相关性，明确影响大泥炭藓生长的主要环境因子及内在机制。结果显示：（1）37个调查样方可分为4个群丛类型，即：Ⅰ、蕨-大泥炭藓群丛（Ass. Pteridium aquilinum-Sphagnum palustre）；Ⅱ、大理薹草-大泥炭藓群丛（Ass. Carex rubrobrunnea var. taliensis-Sphagnum palustre）；Ⅲ、野灯心草+蛇床-大泥炭藓群丛（Ass. Juncus setchuensis+Cnidium monnieri-Sphagnum palustre）；Ⅳ、紫萼+芒尖苔草-大泥炭藓群丛（Ass. Hosta ventricose+Lycopus cavaleriei- Sphagnum palustre）。（2）从群丛Ⅰ~群丛Ⅳ，大泥炭藓的株高、头状枝数量、盖度、生物量4项生长指标均逐渐降低。4群丛间大泥炭藓组织TN、TP、TK、TC含量、C/N、N/P、N/K、含水量9项生理指标均存在显著差异，其中组织含水量、N/K由群丛Ⅰ~Ⅳ呈逐渐上升趋势。（3）地下水位和土壤N/K是影响七姊妹山泥炭藓湿地大泥炭藓群落生长分布的主要环境因子。在长期淹水胁迫环境下，大泥炭藓组织含水量过高，抑制了大泥炭藓的光合作用，阻碍其生长。而在高N负荷下，大泥炭藓的生长受到K的限制，导致养分吸收不平衡，生长发育受阻。临近农田地表径流引起的氮输入可能是造成土壤及泥炭藓组织N/K在群丛Ⅳ中过高的重要因素。

In order to explore the distribution pattern and its environmental driving mechanism of Sphagnum palustre L. community in Sphagnum Wetland of Qizimei Mountain, and further to provide scientific theoretical basis for the protection, restoration and utilization of Sphagnum wetland in subtropical mountain regions, field investigation and sampling for vegetation and environmental factors were conducted on June 2021 using standard sample method, followed by measurement and analysis of these samples. Subsequently, systematic clustering was used in quantitative classification of S. palustre communities; one-way ANOVA, multiple regression analysis and Pearson correlation analysis were used to test the differences in each of the environmental indicators, each of the physiological and growth indicators of S. palustre among the four clusters, as well as to test their pairwise correlation, which ultimately to elucidate the main environmental factors affecting S. palustre growth and its underlying mechanism. Results showed that: (1) A total of 37 field samples were divided into four associations: Ⅰ. Ass. Pteridium aquilinum-Sphagnum palustre; Ⅱ. Ass. Carex rubrobrunnea var. taliensis-Sphagnum palustre;Ⅲ. Ass. Juncus setchuensis+Cnidium monnieri -Sphagnum palustre; Ⅳ. Ass. Hosta ventricose+Lycopus cavaleriei-Sphagnum palustre. (2) Each of the four growth indicators (height, number of capitula, coverage, and biomass) of S. palustre showed gradual decreasing trend from Ass. I to Ass. Ⅳ. Each of the nine physiological indicators (TN, TP, TK, TC, C/N, C/P, N/P, N/K, and water content) in S. palustre tissue showed significant differences among the four associations; among which, tissue water content and N/K in S. palustre exhibited increasing trend from Ass. I to Ass. Ⅳ, with highest values occurred in Ass. Ⅳ.（3）Multiple linear regression analysis showed that water table and soil N/K were principal environmental factors affecting growth and distribution of S. palustre populations in Qizimei Mountain. In this study, excessive water content in S. palustre tissue caused by prolonged flooding stress inhibited its photosynthesis, which further impede the growth. On the other hand, high N load led to S. palustre growth was limited by K, resulting in unbalanced nutrient absorption and thereby inhibiting its growth and development. Nitrogen input from nearby farmland may be an important factor caused excessive N/K ratio in both soil and S. palustre in association Ⅳ.